* AUXMEM.VDU.S * (c) Bobbi 2021 GPLv3 * * Apple //e VDU Driver for 40/80 column mode (PAGE2) * * 15-Aug-2021 Optimised address calculations and PRCHRC. * Entry point to move copy cursor. * Start to consolidate VDU workspace. * 16-Aug-2021 Added COPY cursor handling. * 21-Aug-2021 CHR$(&80+n) is inverse of CHR$(&00+n) * 21-Aug-2021 If screen scrolls, copy cursor adjusted. * 05-Sep-2021 Starting to prepare VDU workspace. * 09-Sep-2021 New dispatch routine. * 22-Sep-2021 More VDU workspace, started MODE definitions. ********************************** * VDU DRIVER WORKSPACE LOCATIONS * ********************************** * # marks variables that can't be moved * * VDU DRIVER ZERO PAGE ********************** * $00D0-$00DF VDU driver zero page workspace VDUSTATUS EQU $D0 ; $D0 # VDU status * bit 7 = VDU 21 VDU disabled * bit 6 = COPY cursor active * bit 5 = VDU 5 Text at graphics cursor * bit 4 = (Master shadow display) * bit 3 = VDU 28 Text window defined * bit 2 = VDU 14 Paged scrolling active * bit 1 = Don't scroll (COPY cursor or VDU 5 mode) * bit 0 = VDU 2 printer echo active * VDUCHAR EQU VDUSTATUS+1 ; $D1 VDUADDR EQU VDUSTATUS+4 ; $D4 address of current char cell OLDCHAR EQU OSKBD1 ; *TEMP* character under cursor COPYCHAR EQU OSKBD2 ; *TEMP* character under copy cursor * VDU DRIVER MAIN WORKSPACE *************************** FXLINES EQU BYTEVARBASE+217 ; Paged scrolling line counter FXVDUQLEN EQU BYTEVARBASE+218 ; Length of pending VDU queue VDUVARS EQU $290 VDUVAREND EQU $2DF GFXWINLFT EQU VDUVARS+$00 ; # graphics window left GFXWINBOT EQU VDUVARS+$02 ; # graphics window bottom \ window GFXWINRGT EQU VDUVARS+$04 ; # graphics window right / size GFXWINTOP EQU VDUVARS+$06 ; # graphics window top TXTWINLFT EQU VDUVARS+$08 ; # text window left TXTWINBOT EQU VDUVARS+$09 ; # text window bottom \ window TXTWINRGT EQU VDUVARS+$0A ; # text window right / size TXTWINTOP EQU VDUVARS+$0B ; # text window top GFXORIGX EQU VDUVARS+$0C ; graphics X origin GFXORIGY EQU VDUVARS+$0E ; graphics Y origin * GFXPOSNX EQU VDUVARS+$10 ; current graphics X posn GFXPOSNY EQU VDUVARS+$12 ; current graphics Y posn GFXLASTX EQU VDUVARS+$14 ; last graphics X posn GFXLASTY EQU VDUVARS+$16 ; last graphics Y posn VDUTEXTX EQU VDUVARS+$18 ; absolute text X posn = POS+WINLFT VDUTEXTY EQU VDUVARS+$19 ; absolute text Y posn = VPOS+WINTOP VDUCOPYX EQU VDUVARS+$1A ; absolute COPY text X posn VDUCOPYY EQU VDUVARS+$1B ; absolute COPY text Y posn * VDUQ EQU VDUVARS+$27 ; *TEMP* $27.$2F CURSOR EQU VDUVARS+$30 ; *TEMP* character used for cursor CURSORED EQU VDUVARS+$31 ; *TEMP* character used for edit cursor CURSORCP EQU VDUVARS+$32 ; *TEMP* character used for copy cursor * VDUPIXELS EQU VDUVARS+$33 ; *TEMP* pixels per byte VDUBYTES EQU VDUVARS+$34 ; *TEMP* bytes per char, 1=text only VDUMODE EQU VDUVARS+$35 ; *TEMP* current MODE VDUSCREEN EQU VDUVARS+$36 ; *TEMP* MODE type VDUCOLOURS EQU VDUVARS+$37 ; *TEMP* colours-1 * * Screen definitions * 3 6 7 SCNTXTMAXX DB 79,39,19,79,39,19,39,39 ; Max text column SCNTXTMAXY DB 23,23,23,23,23,23,23,23 ; Max text row SCNBYTES DB 1, 1, 1, 1, 1, 1, 1, 1 ; Bytes per character SCNCOLOURS DB 1, 1, 1, 1, 1, 1, 1, 1 ; Colours-1 SCNTYPE DB 1, 0,128,1, 0, 0, 0,64 ; Screen type * b7=FastDraw * b6=Teletext * b0=40COL/80COL * = * Addresses of start of text rows in PAGE2 SCNTAB DW $800,$880,$900,$980,$A00,$A80,$B00,$B80 DW $828,$8A8,$928,$9A8,$A28,$AA8,$B28,$BA8 DW $850,$8D0,$950,$9D0,$A50,$AD0,$B50,$BD0 * Output character to VDU driver ******************************** * On entry: A=character * On exit: All registers trashable * CS if printer echo enabled for this character * OUTCHAR LDX FXVDUQLEN BNE ADDTOQ ; Waiting for chars CMP #$7F BEQ CTRLDEL ; =$7F - control char CMP #$20 BCC CTRLCHAR ; <$20 - control char BIT VDUSTATUS BMI OUTCHEXIT ; VDU disabled OUTCHARCP JSR PRCHRC ; Store char, checking keypress JSR VDU09 ; Move cursor right * OSBYTE &75 - Read VDUSTATUS ***************************** BYTE75 OUTCHEXIT LDA VDUSTATUS TAX LSR A ; Return Cy=Printer Echo Enabled RTS CTRLDEL LDA #$20 ; $7F becomes $20 CTRLCHAR CMP #$01 BEQ ADDQ ; One param CMP #$11 BCC CTRLCHARGO ; Zero params ADDQ STA VDUCHAR ; Save initial character AND #$0F TAX LDA QLEN,X STA FXVDUQLEN ; Number of params to queue BEQ CTRLCHARGO1 ; Zero, do it now QDONE CLC ; CLC=Don't echo VDU queue to printer RTS ADDTOQ STA VDUQ-256+9,X INC FXVDUQLEN BNE QDONE CTRLCHARGO1 LDA VDUCHAR CTRLCHARGO ASL A TAY CMP #$10 ; 8*2 BCC CTRLCHARGO2 ; ctrl<$08, don't echo to printer EOR #$FF ; ctrl>$0D, don't echo to printer CMP #$E5 ; (13*2) EOR 255 CTRLCHARGO2 PHP ; Save CS=(ctrl>=8 && ctrl<=13) JSR CTRLCHARJMP ; Call routine PLP BCS OUTCHEXIT ; If echoable, test if printer enabled RTS ; Return, CC=Don't echo to printer OUTCHARGO ASL A ; Entry point to move COPY cursor TAY ; (TEMP and scroll screen) CTRLCHARJMP CPY #6*2 BEQ CTRLCHAR6 ; Always allow VDU 6 through BIT VDUSTATUS BMI VDU00 ; VDU disabled CTRLCHAR6 LDA CTRLADDRS+1,Y PHA LDA CTRLADDRS+0,Y PHA VDU27 VDU00 RTS QLEN DB -0,-1,-2,-5,-0,-0,-1,-9 ; 32,1 or 17,18,19,20,21,22,23 DB -8,-5,-0,-0,-4,-4,-0,-2 ; 24,25,26,27,28,29,30,31 CTRLADDRS DW VDU00-1,VDU01-1,VDU02-1,VDU03-1 DW VDU04-1,VDU05-1,VDU06-1,BEEP-1 DW VDU08-1,VDU09-1,VDU10-1,VDU11-1 DW VDU12-1,VDU13-1,VDU14-1,VDU15-1 DW VDU16-1,VDU17-1,VDU18-1,VDU19-1 DW VDU20-1,VDU21-1,VDU22-1,VDU23-1 DW VDU24-1,VDU25-1,VDU26-1,VDU27-1 DW VDU28-1,VDU29-1,VDU30-1,VDU31-1 DW VDU127-1 * Turn things on and off ************************ * VDU 2 - Start print job VDU02 * JSR select printer LDA #$01 ; Set Printer Echo On BNE SETSTATUS * VDU 5 - Text at graphics cursor VDU05 LDX VDUPIXELS BEQ SETEXIT ; 0 pixels per char, text only * Turn cursor off and other stuff LDA #$20 ; Set VDU 5 mode BNE SETSTATUS * VDU 14 - Select paged scrolling VDU14 STZ FXLINES ; Reset line counter LDA #$04 ; Set Paged Mode BNE SETSTATUS * VDU 21 - Disable VDU VDU21 LDA #$80 ; Set VDU disabled SETSTATUS ORA VDUSTATUS ; Set bits in VDU STATUS STA VDUSTATUS SETEXIT RTS * VDU 3 - End print job VDU03 * JSR flush printer LDA #$FE ; Clear Printer Echo BNE CLRSTATUS * VDU 4 - Text at text cursor VDU04 * Turn cursor on and other stuff LDA #$DF ; Clear VDU 5 mode BNE CLRSTATUS * VDU 15 - Disable paged scrolling VDU15 LDA #$FB ; Clear paged scrolling BRA CLRSTATUS * VDU 6 - Enable VDU VDU06 LDA #$7F ; Clear VDU disabled CLRSTATUS AND VDUSTATUS STA VDUSTATUS RTS * Move editing cursor * A=cursor key, CS from caller COPYMOVE PHA BIT VDUSTATUS BVS COPYMOVE2 ; Edit cursor already on JSR GETCHRC STA COPYCHAR LDA CURSORED JSR PUTCHRC ; Edit cursor SEC JSR COPYSWAP2 ; Initialise copy cursor ROR FLASHER ASL FLASHER ; Ensure b0=0 LDA #$42 ORA VDUSTATUS STA VDUSTATUS ; Turn cursor editing on COPYMOVE2 PLA AND #3 ; Convert to 8/9/10/11 ORA #8 COPYMOVE3 JMP OUTCHARGO ; Move edit cursor * Swap between edit and copy cursors COPYSWAP1 CLC ; CC=Swap TEXT and COPY COPYSWAP2 LDX #1 COPYSWAPLP LDY VDUCOPYX,X LDA VDUTEXTX,X STA VDUCOPYX,X BCS COPYSWAP3 ; CS=Copy TEXT to COPY TYA STA VDUTEXTX,X COPYSWAP3 DEX BPL COPYSWAPLP COPYSWAP4 RTS * Perform backspace & delete operation VDU127 JSR VDU08 ; Move cursor back LDA #' ' ; Overwrite with a space BNE PUTCHRC * Display character at current (TEXTX,TEXTY) PRCHRC PHA ; Save character LDA $C000 BPL :RESUME ; No key pressed EOR #$80 :PAUSE1 JSR KBDCHKESC ; Ask KBD to test if Escape BIT ESCFLAG BMI :RESUMEACK ; Escape, skip pausing CMP #$13 BNE :RESUME ; Not Ctrl-S STA $C010 ; Ack. keypress :PAUSE2 LDA $C000 BPL :PAUSE2 ; Loop until keypress EOR #$80 CMP #$11 ; Ctrl-Q BEQ :RESUMEACK ; Stop pausing JSR KBDCHKESC ; Ask KBD to test if Escape BIT ESCFLAG BPL :PAUSE2 ; No Escape, keep pausing :RESUMEACK STA $C010 ; Ack. keypress :RESUME PLA * Put character to screen PUTCHRC LDY VDUBYTES DEY ; If VDUBYTE=1, text mode BNE PRCHRSOFT ; Graphics mode EOR #$80 ; Convert character TAY AND #$A0 BNE PRCHR4 CPY #$20 BCS PRCHR3 ; Not $80-$9F BIT VDUSCREEN BVC PRCHR3 ; Not teletext LDY #$E0 ; Convert $80-$9F to space PRCHR3 TYA EOR #$40 TAY PRCHR4 PHY JSR CHARADDR ; Find character address PLA ; Get character back PHP ; Disable IRQs while SEI ; toggling memory BCC PRCHR6 ; Aux memory STA $C004 ; Switch to main memory PRCHR6 STA (VDUADDR),Y ; Store it STA $C005 ; Back to aux memory PLP ; Restore IRQs RTS PRCHRSOFT RTS ; *TODO* Jump to gfx * Fetch character from screen at (TEXTX,TEXTY) and return MODE in Y BYTE87 GETCHRC LDY VDUBYTES DEY ; If VDUBYTE=1, text mode BNE GETCHRSOFT ; Graphics mode JSR CHARADDR ; Find character address PHP ; Disable IRQs while SEI ; toggling memory BCC GETCHR6 ; Aux memory STA $C002 ; Switch to main memory GETCHR6 LDA (VDUADDR),Y ; Get character STA $C003 ; Back to aux memory PLP ; Restore IRQs TAY ; Convert character AND #$A0 BNE GETCHR7 TYA EOR #$40 TAY GETCHR7 TYA EOR #$80 TAX ; X=char for OSBYTE LDY #$00 BIT $C01F BMI GETCHROK INY ; Y=MODE GETCHROK RTS GETCHRSOFT RTS ; *TODO* Jump to gfx * Get text cursor position BYTE86 LDY VDUTEXTY ; ROW ; $86 = read cursor pos LDX VDUTEXTX ; COL RTS * Calculate character address CHARADDR LDA VDUTEXTY ASL TAX LDA SCNTAB+0,X ; LSB of row address STA VDUADDR+0 LDA SCNTAB+1,X ; MSB of row address STA VDUADDR+1 LDA VDUTEXTX BIT $C01F SEC BPL CHARADDR40 ; 40-col LSR A CHARADDR40 TAY ; Y=offset into this row RTS * (VDUADDR),Y=>character address * CC=auxmem * CS=mainmem * Move cursor left VDU08 LDA VDUTEXTX ; COL BEQ :S1 DEC VDUTEXTX ; COL BRA :S3 :S1 LDA VDUTEXTY ; ROW BEQ :S3 DEC VDUTEXTY ; ROW LDA #39 BIT $C01F BPL :S2 LDA #79 :S2 STA VDUTEXTX ; COL :S3 RTS * Move cursor right VDU09 LDA VDUTEXTX ; COL CMP #39 BCC :S2 BIT $C01F BPL :T11 CMP #79 BCC :S2 :T11 STZ VDUTEXTX ; COL LDA VDUTEXTY ; ROW CMP #23 BEQ SCROLL INC VDUTEXTY ; ROW :DONE RTS :S2 INC VDUTEXTX ; COL BRA :DONE SCROLL JSR SCROLLER JSR CLREOL RTS * Move cursor down VDU10 LDA VDUTEXTY ; ROW CMP #23 BEQ :TOSCRL ; JGH INC VDUTEXTY ; ROW RTS :TOSCRL JMP SCROLL ; JGH * Move cursor up VDU11 LDA VDUTEXTY ; ROW BEQ :DONE DEC VDUTEXTY ; ROW :DONE RTS * Move to start of line VDU13 LDA #$BF JSR CLRSTATUS ; Turn copy cursor off STZ VDUTEXTX ; COL RTS * Move to (0,0) VDU30 STZ VDUTEXTY ; ROW STZ VDUTEXTX ; COL RTS * Move to (X,Y) VDU31 LDY VDUQ+8 CPY #24 BCS :DONE LDX VDUQ+7 CPX #80 BCS :DONE BIT $C01F BMI :T9A CPX #40 BCS :DONE :T9A STX VDUTEXTX ; COL STY VDUTEXTY ; ROW :DONE RTS * VDU 26 - Reset to default windows VDU26 LDX VDUMODE VDU26A LDA SCNTXTMAXX,X STA TXTWINRGT LDA SCNTXTMAXY,X STA TXTWINBOT RTS * Initialise VDU driver *********************** * On entry, A=MODE to start in * VDUINIT STA VDUQ+8 * VDU 22 - MODE n ***************** * At the moment only MODEs available: * MODE 3 - 80x24 text * MODE 6 - 40x24 text * MODE 7 - 40x24 with $80-$9F converted to spaces * MODE 2 - 280x192 HGR graphics * MODE 0 defaults to MODE 3 * All others default to MODE 6 * VDU22 LDA VDUQ+8 AND #$07 STA VDUMODE TAX ; Set up MODE LDA #'_' ; Set up default cursors STA CURSOR ; Normal cursor STA CURSORCP ; Copy cursor when editing LDA #$A0 STA CURSORED ; Edit cursor when editing LDA #$01 JSR CLRSTATUS ; Clear everything except PrinterEcho JSR VDU26A * LDA SCNBYTES,X STA VDUBYTES LDA SCNCOLOURS,X STA VDUCOLOURS LDA SCNTYPE,X STA VDUSCREEN BMI VDU22G ; b7=1, graphics mode * TEMP CPX #2 BEQ VDU22G ; Jump out for MODE 2 * TEMP * AND #$01 ; 40col/80col bit TAX STA $C00C,X ; Select 40col/80col STA $C051 ; Enable Text STA $C055 ; PAGE2 STA $C052 ; Clear MIXED STA $C00F ; Enable alt charset BRA VDU22CLR VDU22G STA $C050 ; Enable Graphics STA $C057 ; Hi-Res STA $C054 ; PAGE1 STA $C052 ; Clear MIXED JMP VDU16 ; Clear HGR screen VDU22CLR * JSR VDU15 ; Turn off paged scrolling * JSR VDU20 ; Reset colours * JSR VDU26 ; Reset windows * ; Drop through into VDU12, clear screen VDU12 LDY VDUBYTES DEY ; If VDUBYTE=1, text mode BNE VDU12SOFT ; Graphics mode JMP CLEAR * Clear the screen CLEAR STZ VDUTEXTY ; ROW STZ VDUTEXTX ; COL :L1 JSR CLREOL :S2 LDA VDUTEXTY ; ROW CMP #23 BEQ :S3 INC VDUTEXTY ; ROW BRA :L1 :S3 STZ VDUTEXTY ; ROW STZ VDUTEXTX ; COL RTS VDU12SOFT JMP VDU16 ; *TEMP* * Clear to EOL CLREOL LDA VDUTEXTY ; ROW ASL TAX LDA SCNTAB,X ; LSB of row STA ZP1 LDA SCNTAB+1,X ; MSB of row STA ZP1+1 LDA VDUTEXTX ; COL PHA STZ VDUTEXTX ; COL :L1 LDA VDUTEXTX ; COL LSR TAY BCC :S1 >>> WRTMAIN :S1 LDA #" " STA (ZP1),Y >>> WRTAUX LDA VDUTEXTX ; COL CMP #79 BEQ :S2 INC VDUTEXTX ; COL BRA :L1 :S2 PLA STA VDUTEXTX ; COL RTS * Scroll whole screen one line SCROLLER LDA #$00 :L1 PHA JSR SCR1LINE PLA INC CMP #23 BNE :L1 BIT VDUSTATUS BVC :L2 ; Copy cursor not active JSR COPYSWAP1 LDA #11 JSR OUTCHARGO JSR COPYSWAP1 :L2 RTS * Copy line A+1 to line A SCR1LINE ASL ; Dest addr->ZP1 TAX LDA SCNTAB,X STA ZP1 LDA SCNTAB+1,X STA ZP1+1 INX ; Source addr->ZP2 INX LDA SCNTAB,X STA ZP2 LDA SCNTAB+1,X STA ZP2+1 LDY #$00 :L1 LDA (ZP2),Y STA (ZP1),Y STA $C002 ; Read main mem >>> WRTMAIN LDA (ZP2),Y STA (ZP1),Y STA $C003 ; Read aux mem >>> WRTAUX INY CPY #40 BNE :L1 RTS * VDU 1 - Send one character to printer VDU01 RTS * VDU 16 - CLG, clear graphics window VDU16 >>> XF2MAIN,CLRHGR VDU16RET >>> ENTAUX STZ XPIXEL+0 STZ XPIXEL+1 LDA #191 STA YPIXEL RTS * VDU 17 - COLOUR n - select text or border colour VDU17 RTS * VDU 18 - GCOL k,a - select graphics colour and plot action VDU18 LDA VDUQ+7 ; Argument 'k' CMP #$04 ; k=4 means XOR LDA #$00 ; Normal drawing mode BNE :NORM LDA #$01 ; XOR mode :NORM >>> WRTMAIN STA LINETYPE STA FDRAWADDR+5 >>> WRTAUX >>> XF2MAIN,SETLINE VDU18RET1 >>> ENTAUX :NORM LDA VDUQ+8 ; Argument 'a' BPL :FOREGND ; <128 is foreground >>> WRTMAIN STA BGCOLOR ; Stored in main memory >>> WRTAUX RTS :FOREGND >>> WRTMAIN STA FGCOLOR ; Stored in main memory >>> WRTAUX RTS * VDU 19 - Select palette colours VDU19 RTS * VDU 20 - Reset to default colours VDU20 RTS * VDU 23 - Program video system and define characters VDU23 RTS * VDU 24,left;bottom;right;top; - define graphics window VDU24 RTS * VDU 25,k,x;y; - PLOT k,x;y; - PLOT point, line, etc. * x is in VDUQ+7,VDUQ+8 * y is in VDUQ+5,VDUQ+6 * k is in VDUQ+4 VDU25 JSR CVTCOORD ; Convert coordinate system LDA VDUQ+4 AND #$04 ; Bit 2 set -> absolute BNE :ABS JSR RELCOORD ; Add coords to XPIXEL/YPIXEL :ABS LDA VDUQ+4 AND #$03 CMP #$0 ; Bits 0,1 clear -> just move BNE :NOTMOVE JMP HGRPOS ; Just update pos :NOTMOVE LDA VDUQ+4 AND #$C0 CMP #$40 ; Bit 7 clr, bit 6 set -> point BNE :LINE >>> WRTMAIN LDA VDUQ+4 STA PLOTMODE LDA VDUQ+5 STA FDRAWADDR+6 ; LSB of X1 LDA VDUQ+6 STA FDRAWADDR+7 ; MSB of X1 LDA VDUQ+7 STA FDRAWADDR+8 ; Y1 >>> WRTAUX >>> XF2MAIN,DRAWPNT :LINE >>> WRTMAIN LDA VDUQ+4 STA PLOTMODE LDA XPIXEL+0 STA FDRAWADDR+6 LDA XPIXEL+1 STA FDRAWADDR+7 LDA YPIXEL STA FDRAWADDR+8 LDA VDUQ+5 STA FDRAWADDR+9 ; LSB of X1 LDA VDUQ+6 STA FDRAWADDR+10 ; MSB of X1 LDA VDUQ+7 STA FDRAWADDR+11 ; Y1 >>> WRTAUX >>> XF2MAIN,DRAWLINE VDU25RET >>> ENTAUX * Fall through into HGRPOS * Save pixel X,Y position HGRPOS LDA VDUQ+5 STA XPIXEL+0 LDA VDUQ+6 STA XPIXEL+1 LDA VDUQ+7 STA YPIXEL RTS XPIXEL DW $0000 ; Previous plot x-coord YPIXEL DB $00 ; Previous plot y-coord * VDU 28,left,bottom,right,top - define text window VDU28 RTS * VDU 29,x;y; - define graphics origin VDU29 RTS * OSBYTE &A0 - Read VDU variable ******************************** BYTEA0 LDY VDUVARS+1,X LDA VDUVARS+0,X TAX RTS